外文翻譯--一種采用現(xiàn)代先進控制算法的3軸臺式數(shù)控系統(tǒng)銑床

1、1Development of a 3-axis Desktop Milling Machine and a CNC System Using Advanced Modern Control AlgorithmsByung-Sub Kim，Seung-Kook Ro and Jong-Kweon Park 1Nano Convergence Manufacturing Systems Research Division, Korea I

2、nstitute of Machinery & Materials, Daejeon, South Korea, 305-343 Corresponding Author / E-mail: bkim@kimm.re.kr, TEL: +82-42-868-7109, FAX: +82-42-868-7180In this paper, we introduce a desktop-size 3-axis milling mac

3、hine and a CNC system which was developed to operate the 3-axis milling machine. The 3-axis milling machine has a mini-desktop size of 200×300×200 mm3 and its cutting volume is 20×20×20 mm3. The verti

4、cally installed XY stage is driven by voice-coil motors, and for the z-axis, a magnetically preloaded air bearing and a linear motor are used. The air spindle runs at up to 160,000 rpm. The gravity force is acting on the

5、 y-direction, so a weight balancer using an air bearing cylinder is installed to cancel out the gravity force acting on the XY stage in the y-direction. The CNC system designed for the 3-axis milling machine consists of

6、two parts. The one is a graphical user interface program which runs under Microsoft Windows and the other is a DSP program which is implemented on a DSP board with TI TMS320C6701 chips. A G-code interpreter is included i

7、n the CNC system which can interpret and interpolate a basic set of G-codes and M-codes in real-time. To improve the performance of servo control loop in the CNC system beyond the traditional PID-type control, several mo

8、dern control algorithms have been tested including control, input shaping H∞control, disturbance observer and cross-coupled control on the 3-axis milling machine. Experimental results show the effectiveness and drawback

9、s of each control scheme when they are applied to the 3-axis desktop milling machine.KEYWORDS: 3-axis milling machine, CNC system, H control, Input shaper, Cross-coupled control3Two parts communicate each other through a

10、 dual port RAM(Random Access Memory). Job assignments for the two parts are discussed in detail in this paper. To improve the performance of the CNC system for the 3-axis milling machine beyond the traditional PID-type c

11、ontrol, different control schemes have been tested including control, input shaping control, disturbance observer and cross-coupled control on H∞the 3-axis milling machine.The rest of this paper is organized as follows.

12、 Sec. 2 presents the design of the 3-axis milling machine. The results of the finite element analysis and the natural frequencies obtained from the impact hammer test are given in this section. In Sec 3, a PC-based CNC s

13、ystem developed for the 3-axis milling machine is discussed. Several modern control schemes including control design, input shaping control, H∞disturbance observer, and cross-coupled control are discussed with their exp

14、erimental results to show their effectiveness and drawbacks in Sec 4. The concluding remarks will be given in Sec. 5.2. Design of a 3-axis Milling MachineMicro machine tools are required to have high machining accuracy w

15、hile providing enough stiffness. To estimate basic machining performance and stiffness of a micro machine tool, a miniaturized 3-axis milling machine was built and used as a testbed. Fig. 1 shows the 3-axis milling machi